Heat insulating material



Patented Nov. 13, 1934 HEAT INSULATING MATERIAL George Miller Thomson,Caledonia, Ontario, Canada N Drawing. Application December 21, 1931,iggal No. 582,509. In Canada December 17,

2 Claims. (Cl. 106-20) The invention relates to heat insulating materialtreated with heat to cause its layers or laminations of the typeconsisting of a pulverulent, granular to exfoliate or partiallyseparate, thus producing or powdered mass of relatively mobile particlesa light, flaky, non-inflammable material having capable of being pouredto form a heat insulating air spaces between the layers. Pieces of thisma- 5 layer or partition. Many materials of this type terial of fromabout one-eighth to one-half inch 60 are known, for example, groundwallboard, cork may conveniently be employed. According to a and, thelike, preferred form of the invention these pieces of A disadvantage ofthis type of insulating maexfoliated material are mixed as uniformly asterial is that, on account of its incoherent nature, possible withground gypsum wallboard.

it is compressible and therefore liable to settle or The greater theproportion of exfoliated ma- 65 sag if subjected to shaking orvibration, thus interial employed, the less will be insulatingmacreasing the density of the material and reducing terial be able tosettle or sag when subjected to its insulating efficiency, and alsoleaving an unvibration. Good results have been obtained by insulatedspace above the mass of material. mixing to of exfoliated vermiculitewith 15 The present invention has for object to provide to 50% of groundgypsum wallboard.

an improved material of the type described, in What I'claim is: whichthe tendency to settle is greatly reduced, 1. An article of manufactureconsisting of a whereby, under normal conditions of use, the dismass ofground gypsum wallboard having pieces advantage above mentioned issubstantially elimiof exfoliated vermiculite varying in size from one-20 nated or, at least, reduced to negligible proporeighth to one-halfinch distributed throughout tions. the mass.

With this end in view the invention consists in 2. An article ofmanufacture consisting of a a heat insulating material of the kinddescribed mixture of 40 to 50% by weight of exfoliated verhaving smallpieces of an exfoliated mineral submiculite and 60 to 50% of groundgypsum wall- 25 stance of laminated form distributed throughout board.

the mass. GEORGE MILLER THOMSON.

The preferred mineral substance is vermiculite so s5

